Induction current generating apparatus for medical treatment



July 16, 1929. Y. NOISHIKI 1,721,031

INDUCTION CURRENT GENERATING APPARATUS FOR MEDICAL TREATMENT Filed 'Jan 30, 1928 mgr Patented July 16, 1929.

UNITED STATES 1,121,031 PATENT QFFICE.

YOSHTTOSHI NOISHIKI, F TOKYO, JAPAN.

INDUCTION CURRENT GENERATING APPARATUS FOR MEDICAL TREATMENT.

Application filed January 30, 1928, Serial No. 250,665, and in Japan February 1, 1927.

This invention relates to an induction current generating apparatus for medical treat ment having a suitable variable resistance in its primary circuit, which always cooperates with an iron core of an induction coil to 1ncrease or decrease the magnetic flux, and its object is to obtain electric current most effective for the human body by controlling freely the secondary current induced in the induced coil with the adjustment of the primary current, and also to avoid unpleasant sparking in the contact point of a relay. I

Referring to the accompanying drawing,

Fig. l is the sectional front elevation of I this apparatus;

Fig. 2, the plan; and Fig. 3, the wiring-diagram of the apparatus.

In this invention, a suitable variable resistance is inserted in a primary circuit of an induction coil for medical treatment and the sliding contact of this resistance is always moved in connection with an iron core of the induction coil. Thus, by adjusting the iron core andprimary current together, the induced current in the secondary circuit of the coil can be controlled at will.

In the drawing, 1 is a casing; and 2, a cover plate fixed thereon. 3 and 4 are a pair of contact terminals, and the removal or insertion of a plug 5 opens or closes an electric circuit. 6 and 7 are contact poles of a switch, the closing or opening of which makes or breaks the other circuit. A pair of arms 9 and 10 of another switch are connected toget-her and move in parallel. Their pivoted points form two terminals 11 and 12, while at their free ends contact springs 13 and 14 are fixed on the lower'sides, and the upper sides are connected by a connector15 of in sulating material, the middle part of which is equipped witha knob 16. Onthe cover plate other contact pieces 17 and 18 are fixed in the position where they come into contact with the lower parts of the pieces 13 and 14. 17 and 18 are placed on the same plane and insulated from each other. only the middle contact piece 17 is connected with a lead wire which will be explained later. The other pieces 18 merely serve as guides of the contact pieces 13 and 14 of the switch arms 9 and 10. The construction of this switch and the above-mentioned two switches is not restricted to the above forms, but may be suitably changed.

On the left side of'this apparatus a relay In this switch, v

is equipped. This relay has two coils 1'9 and 20, and a common vibrator 21 is connected with a frame 22 of the relay. On the, upper side of the free end of the vibrator 21, an ad ustable contactneedlc 24 is placed and its point always contacts with the vibrator 21.

At the central part of the apparatus a resistance wire 25 is placed under the cover plate 2 and its resistance may be adjusted by a sliding arm 26 which is in contact with the resistance Wire. This sliding arm 26 forms one end of a rack 27 made of conducting material, which has a longitudinal guide groove 29 along its axis, the groove being guided by a fixed pin 28. The rack 27 meshes with a pinion 32 upon the axis of which is mounted a pointer 30 and a knob 31 on the cover 2. A graduated scale 37 for the pointer is placed on the surface of the cover 2.

The right hand end of the rack 27 is connected with an iron core 33 which is movable in the hole of the induction coil 34. There fore, if the knob 31 is rotated clockwise or counterclockwise, the rack 27 is moved right or left by the rack and pinion 32 in mesh, so that the position of the sliding contact may be changed and thus the resistance may be adjusted, while at thesame time the iron core 23 is inserted into or pulled out of the hole of the coil.

The coil under the cover plate 2 on the right hand side of this apparatus has two taps 35 and 36 in the middle of the winding.

Fig. 3 shows diagrammatically the electrical connection'of this apparatus. A and B are batteries or other suitable direct current sources. A is used chiefly for the circuit of weak and medium current; and B, as a source for the circuit of comparatively large current.

The circuit of weak and medium current is as follows It starts from the positive terminal of the battery A and passes through wires 51 and 52, the vibrator 21, contact 24, wire 53, pinion 32, rack 27, sliding arm 26, variable resistance 25, wire 54, whole windings of the coil 34, wire 55, coil of the relay 19, wires 56 and 57 contact terminals 3 and 4, and wire 58 and finally reaches the negative terminal of the battery A.

Next, the circuit of comparatively large current is as follows It starts from the positive terminal of the battery B, and is closed through the wire 59,

contact poles 6 and 7 of the switch wire 60, the other coil 20 of the relay, wires 61 and 56,

the coil 19 of the relay, the above-mentioned .wire 55, coil 34, wire 54, adjustable resistance,

the wire 53, contact 24, vibrator 21, wires 52 and 63 and the negative terminal of the battery B.

Now, the terminals of the secondary circuit of weak and medium current are 64 and 65.- 64 is connected with the taps 36 and 35 of the coil 34 by the wire 67, contact pole 17 switch blades 9 and 10, while is connected with the wire 55 by the wire 66. The terminals of the secondary circuit of large current are 68 and tently owing to the vibration of the vibrator 21. Therefore, electro-motive force due to self-induction of the coil 34 is induced between terminals 68 and 69, from which high voltage electricity for medical treatment can be supplied.

Next, the above circuit will be opened, it the switch blade 8, is opened. By inserting the plug 5 between the contact terminals 3 and 4, the circuit for direct current source A -will be closed, which consists, as already mentioned, of the source A, wires 51 and 52, vibrator 21, contact needle 24, wire 53, pinion 32, sliding arm 26, resistance 25, wire 54 coil 34, wire 55, relay coil 19, wires 56 and 57, contact terminal 3, plug 5, contact terminal 4 and Wire 58. As the direct current through this circuit is interrupted intermittently by the vibrating action of the vibrator 21, electro-motive force is induced in the secondary circuit, consisting of the terminals 64, wire 67, switch blade 17 tap 35 or 36, a part of the coil 34, wire 55 and the terminal 65. In thiscase, the current flows only through one coil 19 of the relay, but not through the other 20.

Moreover, the secondary circuit includes only one part of the induction coil 34, so that the induced E. M. F. between the terminals 64 and 65 is smaller than that induced between 68 and 69 in the above case and it is smallest for the circuit of the tap 35.

The above mentioned currents in the secondary circuits may be adjusted suitably by the variable resistance which is common in each of the primary circuits and by the iron core which movesin the coil 34 in connection with the sliding arm of this resistance. That is to say, if the rack 27 is moved right or left by rotating the pinion 32 with the knob 31, the resistance of the primary circuit may be changed and this operation pulls the iron' core out of or inserts it into the coil. T herefore, when the primary current is increased, the electro-magnetic coupling between the coil and the core becomes tight, thereby obtaining secondary current of large magnitude for medical treatment. On the contrary, if the primary current is reduced by increasing the resistance, the electro-magnetic coupling becomes loosened at the same time, and the secondary current will become weak. The amount of the current can easily be adjusted by the scale 37 and pointer 30 on the cover plate 2.

In short, this invention has such a characteristic feature that electric current for medical treatment most eli'ective for the human body can be obtained by adjusting at will the induced E. M. F. between the terminals of large, medium and weak currents, which can be etl'ected with the proper adjustment ,of the current density ot the coil 34 in the primary circuit by the combined movement of the sliding arm of the resistance and the iron core. the proper adjustment of which also avoids disagreeable sparking in the re-.

, lay contact.

Claims:

1. An induction current generating apparatus for medical treatment having adjustable resistance in its primary circuit includ= ing an induction coil and an iron core m0v able in said coil cooperating with said resistance to control the induced electrometive force, said adjustable resistance being common to two primary circuits for comparatively small and large currents.

2. An induction current generating apparatus for medical treatment having adjustable resistance so connected with an iron core that they cooperate with each other to adjust the current density and simultaneously adjust the induced electromotive force, the adjustable resistance forming common paths for comparatively weak and strong cur.- rents.

3. An induction current generating apparatus having a circuit for comparatively small current including only one winding of the relay and a circuit for comparatively large current including two windings of the relay, the secondary circuits having a common induction coil intoand out of which an iron core connected with an adjustable resist ance may move.

In testimony whereof I have afiixed my signature.

YOSHITOSHI NOISHIKI. 

